Refrigerant



July 28, 1925, 1,547,202

J. M. CHANDLER REFRIGERANT Fi'ied Dec. 19 1922 I Patented July 28, 1925.

J osnrn MITCHELL CHANDLER, or EAST'BRIDGEWATER, MASSACHUSETTS, ASSIGNOR TO CLARENCE A. CHANDLER, DOING BUSINESS AS CHANDLER PANY, OF EAST BRIDGEWATER, MASSACHUSETTS,

REFRIGERANT.-

Application filed December 19, 1922. Serial No. 607,795.

'To all whom it may concern:

Be it known that I, JOSEPH MITCHELL CHANnLER, a citizen of the United States, residing at East Bridgewater,'in the county of Plymouth and State of Massachusetts,-

have invented new and useful Improvements in Refrigerants, of which the following 1s a specification. v v

The common refrigerating gases, such as ammonia, sulphur dioxide and ethyl chloride, heretofore used for purposes of refrig- H eration, possess various objectionable features, such for example as their toxl-c properties, their corrosive effect on pipes or receptacles in which they .are used, the heavy pressures required for their condensatlon, and their action on lubricating 011s. 1

' I have discovered that methyl bromide (monobromomethane) possesses. many characteristics and properties which render its use, as a refrigerating gas, of great value in refrigeration, and the present invention consists of methyl bromide as a new or improved agent for use in a refrigerating machine.

Among the advantages secured by the useof this gas are the following. It has no corrosive action whatever .on metals, and being neither acid nor alkali it has no tendency to break down or deleteriously effectlubricating oils. Owing to the fact that its boiling point is 4.5" (7., it requires only a low I vacuum (or minus pressure) to boil in the expansion chamber of a refrigerating apparatus, and a low pressure in the condenser chamber for its liquefaction. Consequently point of safety, in that the. possibility of the possibility of-sucking air on the reduced pressure side of the system and of leakageon the high pressure side are greatly minimized. Further methyl bromide is particularly adapted for use withv certain types of rotary compressor which have a high efi'iciency within the range of pressure required. Moreover, since only a low condenser pressure is required, there is .a further advantage of its use, from the standexplosion is reduced, particularly when it is used in small automatic machines installed in residences, shops, meat markets or other places where the machines are not under the supervision and constant control of an engineer.

Again, there is no firehazard incident to the use of methyl bromide as a refrigerating agent, or to its storagev or shipment. Owing to; the high density of the vapor, the volume of gas to be compressed is compara- OONSTBUCTION COM- tively small, with a resultant high efli-ciency in refrigeration. I q

The toxic action. is slight, but the odor, though pleasant, is readily detected, and thus any leakage is readily noted. v

In addition to these advantages, others may be pointed out,namely, the stability of the gas in that it is not broken down even when subjected to comparatively high temperatures, and the practical impossibility of its generating permanentgases, due to its high critical temperature (194 (1.). Moreover it is unnecessary to use any particular precautions to remove air from the refrigcrating apparatus, when methyl bromide is to be used therein.

On the accompanying drawing, I have illustrated conventionally an apparatus 'for carrying out a process of refrigeration in which methyl bromide constitutes therefrigerating agent. The gas is compressed by the compressor 1 (which may be of the rotary type), and passes through the condenser 2 to the pressure-reducing valve or other pressure-reducing device 3,"thence to the expansion chamber 4, and finally returns to the compressor, thus completing the cycle. The variation in pressure inthe condenser and the expansion chamber is relatively small, and the pressure on the condenser side of low.

What I claimis": i.

, The use, as a refrigerant capable of being alternately compressedand liquefied and then-expanded and gasified, of that organic substance known as methyl bromide without admixture with other agents. 7

In testimony whereof I have aflixed my signature.

JOSEPH MITCHELL CHANDLER; 

